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Do ".  1 _ _ Numbers

".y executes the sentence y. If the execution results in a noun, the result of ".y is that noun; if the execution result is a verb, adverb, or conjunction, the result of ".y is an empty vector.
 		   x".y converts character array y into numbers. The shape of the result is (}:$y),n where n is the maximum number of numbers in any row. x is a scalar number used to replace illegal numbers and to pad narrow rows. In the conversion, the normal rules for numeric constants are relaxed as follows:
  • the negative sign can be - or _
  • commas within numbers are ignored
  • fractions need not have a digit 0 before the decimal point

For example:
   ". s=: '5 * a=: 3 + i. 6'
15 20 25 30 35 40

   a
3 4 5 6 7 8

   do=: ".
   do t=: '3 % 5'
0.6
   do |. t
1.66667
   $ do ''
0

   ]program=: 'a=: 2^3' ,: '5*a'
a=: 2^3
5*a

   do program
8 40

   do 'sum=: +/'

   sum 1 2 3 4
10

   s ; _999". s=: '1 2 3','-4 .5',:'bad 3,141'
+---------+--------------+
|1 2 3    |   1    2    3|
|-4 .5    |  _4  0.5 _999|
|bad 3,141|_999 3141 _999|
+---------+--------------+


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